Ricoh Company, Ltd.

Mayumi Yoshihara

Akihiko Matsuyama

Kazuhiko Umemura

Yukio Fujiwara

Yuuki Yokohama

Shinji Nohsho

Kohsuke Yamamoto

Amika Sagara

Masaki Kudo

Mihoko Matsumoto

Hiroaki Takahashi

Masahide Yamashita

Michihiko Namba

Hidetoshi Kami

Koichi Kato

Takashi Tamai

Kiminori Masuda

Kazuhiro Egawa

Yukihiro Imanaga

Kento Sugita

Daiki Hasebe

An ink contains water, a coloring material, a resin, and an organic solvent, wherein the dried layer of the ink has a surface free energy γhaving a polar component γof from 3.5 to 20 J/mat 25 degrees C.

Ink, image forming apparatus, and image forming method

A clear ink includes resin particles, water, and a compound represented by General Formula (1) below. The resin particles have a volume average particle diameter of 50 nm or less. A dried film of the clear ink has glass transition temperatures (Tg) at 50 degrees Celsius or higher and at lower than 0 degrees Celsius. In the General Formula (1), Rrepresents an alkyl group having 1 or more but 4 or less carbon atoms.

Clear ink, printing method, and inkjet printing apparatus

An ink includes at least one polyether-modified siloxane compound, and at least one aliphatic alcohol alkylene oxide compound. The mass ratio of the polyether-modified siloxane compound to the aliphatic alcohol alkylene oxide compound in the ink is from 95/5 to 50/50.

Ink, ink set, ink container, image forming method, image forming apparatus and recorded matter

An ink comprises a pigment, a quinacridone derivative represented by the following Chemical formula 1. 

Ink, ink container, inkjet recording device, and recording method

An image forming apparatus includes an image bearer; a charging member to charge the surface of the image bearer; an irradiating member to irradiate the surface of the image bearer to form an electrostatic latent image on the surface of the image bearer; an developing member to develop the electrostatic latent image with a toner to form a visible toner image on the surface of the image bearer; and a transferring member to transfer the toner image onto a transfer material. The image bearer includes a charge generation layer including an asymmetrical disazo pigment and a metal-free phthalocyanine pigment, and a charge transport layer. The irradiating member forms the electrostatic latent image at an irradiation energy greater than a half decay exposure of the image bearer and not greater than 2.5 times of the half decay exposure. The image bearer is not discharged every image forming process.

Image forming apparatus

An image forming apparatus includes an electrophotographic photoreceptor that bears a latent image, an electrostatic charging unit that negatively charges the electrophotographic photoreceptor uniformly with electricity, and a latent image writing unit that writes a latent image on the electrophotographic photoreceptor. A one-component developing unit renders the latent image visible by developing thereof. A transfer device transfers the toner image from the electrophotographic photoreceptor onto a transfer medium. The inequality C&#xd7;V&#x3c;Q&#x2266;1.5&#xd7;C&#xd7;V is satisfied where C is an electrostatic capacitance of the electrophotographic photoreceptor, V is an absolute value of a surface potential of the electrophotographic photoreceptor after it is electrically charged by the electrostatic charging unit in an electrostatic charging process, and Q is an absolute value of an electrical charge calculated based on an amount of electrical current sent to the electrophotographic photoreceptor in the electrostatic charging process.

Residual voltage reducing processing cartridge, image forming apparatus with same, and image forming method

An image forming apparatus including an image bearing member having a photosensitive layer and the surface including concave portions having a concave diameter of from 5 to 200 &#x3bc;m, an irradiation device that irradiates the surface of the image bearing member with light to form a latent electrostatic image thereon, a development device that develops the latent electrostatic image with a development agent containing toner to obtain a visualized image, a transfer device that transfers the visualized image to a transfer medium, a first cleaning brush to which a bias is applied with a polarity reverse to that of the toner remaining on the surface of the image bearing member after the visualized image is transferred, and a second cleaning brush to which a bias is applied with the same polarity as that of the toner remaining on the surface of the image bearing member.

Image forming apparatus, image bearing member, and method of manufacturing image bearing member

An electrophotographic photoreceptor including a conductive substrate, a photosensitive layer, and a surface layer, which satisfies the following inequations:0.005&#x3c;()&#x3c;0.03&#x2003;&#x2003;(i)0.010&#x3c;()&#x3c;0.03&#x2003;&#x2003;(ii)0.005&#x3c;()&#x3c;0.20&#x2003;&#x2003;(iii)()&#x3e;()&#x2003;&#x2003;(iv)()&#x3e;()&#x2003;&#x2003;(v)wherein WRa (&#x3bc;m) represents a center-line average roughness of frequency components LHH, LHL, LMH, LML, LLH, and LLL that are obtained by subjecting a one-dimensional data array of a surface profile of the electrophotographic photoreceptor to wavelet transformation multiresolution analysis so as to be separated into 6 frequency components; thinning a one-dimensional data array of the lowest frequency component so that the number of data array is reduced to 1/40; and subjecting the thinned one-dimensional data array to wavelet transformation multiresolution analysis so as to be separated into the 6 frequency components LHH, LHL, LMH, LML, LLH, and LLL.

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Kanagawa, Japan

Mayumi Yoshihara